"He couldn't hear us if he was in some of the levels or crosscuts," remarked Chub. "Del was hired to keep a sharp watch on this mine while it's lying idle, an' I don't think he'd go 'way. He must be down there. I'll go back to the house for a candle, and we'll take a hunt through the workings."

Chub was but a minute in getting back with a couple of candles. These were lighted, and the boys started down the rickety ladders, Matt leading the way.

The shaft was a hundred feet deep, and there were two levels opening off it—one half-way down, and the other at the bottom.

Matt and Chub got off the ladders at the first level, walked to the end of the passage, and there, by means of a winze connecting the two levels, descended to the bottom of the mine and made their way back to the shaft again. Thus they made the complete circuit of the workings—and without finding any trace of Delray. They climbed disappointedly up the shaft, after having been in the mine for about half an hour.

"This is tough luck, Matt," muttered Chub. "I wonder if there has been any foul play here? When Hawley is out for a big winning, it isn't much that he'll stop at."

"He wouldn't have the nerve to go too far with Delray," answered Chub. "Hawley is unscrupulous, all right, but he's not going to get the law down on him if he can help it."

"He might have had some of his roughs run Delray off while those wireless instruments were bein' smashed."

"No, I don't think he'd do even that. It looks to me as though some villain had stolen into the house and wrecked the instruments while Del was out—just as the job was done at your place in Phœnix."

"The farther we go in this thing the more mysterious it gets."

"And the more we see that Hawley is leaving no stone unturned to beat your father out of that mining-claim. We'd better make a quick run to the 'strike,' Chub, and see what shape matters are in there. From the looks of things this far, the prospect worries me."